A lane is a marked section of roadway wide enough for one line of vehicle traffic. Roads may have single or multiple lanes in each direction, with lane configurations affecting traffic capacity and flow. Municipal transportation departments determine lane configurations based on traffic volumes, road width, and safety considerations. Lane types include through lanes for continuing traffic, turn lanes for vehicles changing direction, and dedicated lanes for transit, bicycles, or high-occupancy vehicles. Lane markings, typically white or yellow painted lines, guide drivers and separate traffic flows. Proper lane design and maintenance are essential for road safety and efficient traffic movement.